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Telescopic Alidade
Parts and
Functions
The following are the parts and functions of the telescopic alidade
shown in figure 2-19.
Part
Description of Function
Ring
Light filter knob
Polarizing
adjustment knob
Level
Fits upon a 7½ inch gyro repeater.
Enables the observer to switch to an internal
light filter, which protects your eye from the
brightness of the Sun.
Enables the observer to adjust the light filter
from light to dark, depending on the
brightness of the Sun.
Indicates if the ring is level with the
horizon. Bearings read when the circle is
not level are NOT ACCURATE!
Focus knob
Enables the observer to adjust the internal
telescope lens so the view is focused.
Figure 2-19. Telescopic alidade.
2-30
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